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The question, Are we Supposed to….. , The answer: No. You will learn it by using it. Can you memorize if you want? Sure. If you like doing that type of learning I have heard accounts here that it has been useful and helpful for the people that did it. I tried to do it, made flashcards and everything, it did not work for me so I abandoned the exercise. I suppose I learned the notes like a child learns to talk, I just did it a lot and over time all the blanks filled in. Every time you memorize a chord shape you learn 3 notes. The strings all have relative relationships to each other and for me that was more useful figuring out what that was and how the sound fits together rather than learning notes by rote. Notes filled themselves in with use over time. Knowing the Key? now that is where Mandatory is the word.